How do people create hundreds of FB accounts?

Hey guys, am new here and looking forward to learn plenty of new materials everyday here.
There's something I've been wondering though, I've seen people with hundreds 100-500+ of fake accounts. How do they do that? I've tried creating dupe accounts and after 2nd or 3rd attempt, Facebook will start to ask for phone verification. How do those people bypass the system and create tons of accounts?

Im also looking for a program that can create accounts and get around the phone number verification. Ive made accounts on my own, but its now asking for the phone # to be verified, im assuming once that happens the accounts are no longer any good? Can FaceDominator get around the phone verification?

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